A water chiller system and a control method thereof

Abstract

The application provides a water chiller system and a control method thereof, and relates to the technical field of air conditioners. The water chiller system comprises: a chilled water circulation loop, the chilled water circulation loop comprising at least one chilled water main unit, a water distributor, a water collector and at least one chilled water pump connected in sequence; a cooling water circulation loop, the cooling water circulation loop comprising at least one chilled water main unit, at least one cooling water pump and at least one cooling tower connected in sequence; and a controller configured to: acquire operation data of the water chiller system and a user demand refrigerating capacity; correct the user demand refrigerating capacity according to the operation data of the water chiller system to obtain a corrected user demand refrigerating capacity; determine a first loss refrigerating capacity and a second loss refrigerating capacity according to the operation data of the water chiller system; determine a target refrigerating capacity according to the corrected user demand refrigerating capacity, the first loss refrigerating capacity and the second loss refrigerating capacity; and control the water chiller system to work according to the target refrigerating capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly relates to a water chiller system and a control method thereof. BACKGROUND

[0002] At present, in a central air conditioning system, a water chiller system as a core refrigeration equipment of the central air conditioning supplies circulating cold water to a cold equipment through a water circulation pipeline to perform temperature adjustment. The water chiller system and the indoor cold equipment are independently controlled.

[0003] During operation of the central air conditioning system, it is very important to control the refrigeration of the air conditioning system according to the refrigeration capacity of a user end. If the detection result of the refrigeration capacity of the user end is inaccurate, the actual refrigeration capacity of the air conditioning system and the refrigeration capacity of the user end will have a large deviation, thereby causing a poor experience of the user. For this purpose, in the related art, the temperature difference or the pressure difference between a water distributor and a water collector is generally used to represent the refrigeration capacity of the user, but the refrigeration capacity of the user obtained by this method is inaccurate, thereby affecting the refrigeration control of the air conditioning. SUMMARY

[0004] Embodiments of the present application provide a water chiller system and a control method thereof, which are used to obtain a target refrigeration capacity according to operating parameters of the water chiller system, and adjust the operation of the water chiller system according to the target refrigeration capacity.

[0005] To achieve the above object, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a water chiller system is provided, which comprises:

[0007] a chilled water circulation loop comprising a water chiller, a water distributor, a water collector and at least one chilled water pump connected in sequence;

[0008] a cooling water circulation loop comprising the water chiller, at least one cooling water pump and at least one cooling tower connected in sequence;

[0009] a controller configured to:

[0010] obtain operating data of the water chiller system and a user demand refrigeration capacity;

[0011] correct the user demand refrigeration capacity according to the operating data of the water chiller system to obtain a corrected user demand refrigeration capacity;

[0012] determine a first loss refrigeration capacity and a second loss refrigeration capacity according to the operating data of the water chiller system; wherein the first loss refrigeration capacity is the refrigeration capacity lost by the chilled water through the pipeline, and the second loss refrigeration capacity is the refrigeration capacity lost by the chilled water through each chilled water pump;

[0013] Determine a target refrigeration capacity according to the modified user demand refrigeration capacity, the first lost refrigeration capacity and the second lost refrigeration capacity;

[0014] Control the chiller system to work according to the target refrigeration capacity.

[0015] The technical scheme provided by the embodiments of the present application at least brings the following beneficial effects: in the running process of the chiller air conditioning system, the refrigeration capacity generated by the chiller host is used for heat exchange with the space where the cold equipment is located through the chilled water in the chilled water circulation loop to achieve the effect of cooling the space where the cold equipment is located. In this process, due to the loss of the chilled water in the process of passing through the connecting pipeline and the chilled water pump and other equipment, the refrigeration capacity at the user side is different from the refrigeration capacity at the chiller host side, so the user demand refrigeration capacity is modified according to the running data of the chiller to obtain the modified user demand refrigeration capacity. Then, the target refrigeration capacity is determined by the modified user demand refrigeration capacity, the refrigeration capacity lost by the chilled water in the connecting pipeline (the first lost refrigeration capacity) and the refrigeration capacity lost by the chilled water in the chilled water pump and other equipment (the second lost refrigeration capacity) to control the running of the air conditioning system accordingly, so as to meet the refrigeration capacity demand of the user.

[0016] In some embodiments, the running data of the chiller system includes: the refrigeration capacity at the chiller host side, the refrigeration capacity at the chiller room side, the refrigeration capacity at the user side, the outdoor temperature, the outdoor humidity, the average flow of the personnel distribution in the region, the building temperature preservation parameter, the light intensity compensation value, the indoor and outdoor air flow rate difference value, the current time, the first pipeline length, the second pipeline length, and the number of open valves of the chilled water pump; wherein the first pipeline length is the length of the connecting pipeline in the chilled water circulation loop in the chiller room; and the second pipeline length is the length of the connecting pipeline in the chilled water circulation loop outside the chiller room.

[0017] It can be understood that in the running process of the chiller, the chilled water passing through the connecting pipeline in the chiller room will consume a certain amount, thereby affecting the actual refrigeration capacity at the user side. At the same time, the outdoor temperature, the outdoor humidity, the average flow of the personnel distribution in the region, the building temperature preservation parameter, the light intensity compensation value, the indoor and outdoor air flow rate difference value, the current time, the second pipeline length, and the number of open valves of the chilled water pump all affect the actual refrigeration capacity at the user side in the process of the chilled water flowing from the chiller room to the indoor cold equipment.

[0018] In some embodiments, the controller of the chiller system is configured to modify the user demand refrigeration capacity according to the running data of the chiller system to obtain the modified user demand refrigeration capacity, and specifically performs the following steps: according to the outdoor temperature, the outdoor humidity, the average flow of the personnel distribution in the region, the light intensity compensation, and the indoor and outdoor air flow rate difference value, the user demand refrigeration capacity is modified to obtain the modified user demand refrigeration capacity.

[0019] It can be understood that the user demand refrigerating capacity is the refrigerating capacity set by the user in an ideal state, and the user demand refrigerating capacity needs to be corrected according to actual environmental conditions to obtain the refrigerating capacity required to be output by the air conditioning system in the future. Among them, the outdoor temperature, the outdoor humidity, the average flow of the personnel distribution in the region, the building temperature preservation parameter, the light intensity compensation value and the indoor and outdoor air flow rate difference in the environmental state are in a positive correlation with the refrigerating capacity required to be output by the air conditioning system in the future.

[0020] In some embodiments, the controller of the chiller system is configured to determine the first loss refrigerating capacity according to the operation data of the chiller system, specifically by performing the following steps: determining the first loss refrigerating capacity according to the machine room side refrigerating capacity, the user side refrigerating capacity, the current time and the first pipeline length.

[0021] It can be understood that there is a refrigerating capacity loss of the first pipeline (i.e. the pipeline in the chiller room) between the chiller main machine side refrigerating capacity and the machine room side refrigerating capacity, and there is a refrigerating capacity loss of the second pipeline (i.e. the pipeline between the chiller room outlet and the cold-using equipment) between the chiller room side refrigerating capacity and the user side refrigerating capacity, so the refrigerating capacity loss on the connecting pipeline can be calculated according to the chiller room side refrigerating capacity and the user side refrigerating capacity.

[0022] In some embodiments, the controller of the chiller system is configured to determine the second loss refrigerating capacity according to the operation data of the chiller system, specifically by performing the following steps: determining the second loss refrigerating capacity according to the machine room side refrigerating capacity, the user side refrigerating capacity, the current time and the second pipeline length.

[0023] It can be understood that during the operation of the chiller system, the refrigerating water has a certain refrigerating capacity loss when passing through the refrigerating water pump and its valve, so the refrigerating capacity loss of the refrigerating water passing through the refrigerating water pump and its valve in the chiller room can be obtained according to the number of refrigerating water pump valves opened and the length of the pipeline in the chiller room.

[0024] In a second aspect, the embodiments of the present application provide a control method applied to a chiller system, the method comprising: a controller, the controller being configured to: acquire operation data of the chiller system and a user demand refrigerating capacity; correct the user demand refrigerating capacity according to the operation data of the chiller system to obtain a corrected user demand refrigerating capacity; determine a first loss refrigerating capacity and a second loss refrigerating capacity according to the operation data of the chiller system; wherein the first loss refrigerating capacity is the refrigerating capacity loss of the refrigerating water passing through the pipeline, and the second loss refrigerating capacity is the refrigerating capacity loss of the refrigerating water passing through each refrigerating water pump; determine a target refrigerating capacity according to the corrected user demand refrigerating capacity, the first loss refrigerating capacity and the second loss refrigerating capacity; and control the chiller system to work according to the target refrigerating capacity.

[0025] In a third aspect, an embodiment of the present application provides a controller, comprising: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program codes, the computer program codes comprising computer instructions, when the one or more processors execute the computer instructions, the controller performs the control method provided in the second aspect.

[0026] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, the computer readable storage medium comprising computer instructions, when the computer instructions are controlled on a computer, the computer executes the method provided in the second aspect and possible implementation manners.

[0027] In a fifth aspect, an embodiment of the present application provides a computer program product, the computer program product can be directly loaded into a memory and contains software codes, and the computer program product can realize the method provided in the second aspect and possible implementation manners after being loaded and executed by a computer.

[0028] It should be noted that the computer instructions described above can be stored in the computer readable storage medium in whole or in part. The computer readable storage medium can be packaged together with the processor of the controller or packaged separately from the processor of the controller, and the present application does not limit the same.

[0029] The beneficial effects of the second aspect to the fifth aspect described in the present application can be analyzed with reference to the beneficial effects of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A structural schematic diagram of a water chiller system provided by an embodiment of the present application;

[0031] Figure 2 A structural schematic diagram of another water chiller system provided by an embodiment of the present application;

[0032] Figure 3 A refrigerant circulation principle schematic diagram of a water chiller system provided by an embodiment of the present application;

[0033] Figure 4 A structural schematic diagram of another water chiller system provided by an embodiment of the present application;

[0034] Figure 5 A hardware structure schematic diagram of a controller provided by an embodiment of the present application;

[0035] Figure 6 A refrigerant circulation principle schematic diagram of a water chiller system provided by an embodiment of the present application;

[0036] Figure 7A cooling water circulation principle schematic diagram of a water chiller system provided by an embodiment of the present application is provided.

[0037] Figure 8 A flow chart of a control method of a water chiller system provided by an embodiment of the present application is provided.

[0038] Figure 9 A communication topology schematic diagram of a cold equipment provided by an embodiment of the present application is provided.

[0039] Figure 10 A hardware structure schematic diagram of a controller provided by an embodiment of the present application is provided. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0043] In the description of the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0044] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, use of the words "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0045] As described in the background, in the chiller system, the accurate monitoring of the user cooling load is crucial. However, in the related art, two load control methods, i.e. temperature difference control or pressure difference control, are generally used. The principle of the temperature difference control is to collect the temperatures of the water distributor and the water collector in the chiller system, and to take the difference between the two temperatures as a control parameter to control the outlet water temperature of the refrigeration side of the chiller. However, the load obtained according to the temperatures of the water distributor and the water collector is only a rough parameter and cannot accurately correspond to the load of the user end. The principle of the pressure difference control is to collect the pressures of the water distributor and the water collector, and to take the difference between the two pressures as the load of the user end, and then to dynamically adjust the power of the refrigeration water pump to obtain a suitable pressure difference. However, since the pressure difference is variable, the load of the user end cannot be accurately corresponded.

[0046] To solve the above technical problems, the embodiments of the present application provide a chiller system and a control method thereof. The actual refrigeration capacity of the chiller, the refrigeration capacity generated at the chiller room side, the actual refrigeration capacity used by the user, and the required refrigeration capacity of the user are collected to determine the corrected accurate user required refrigeration capacity. The corrected accurate user required refrigeration capacity and the target refrigeration capacity of the lost cooling capacity of the circulating water are combined to determine the operation of the chiller system.

[0047] To further describe the technical solutions of the embodiments of the present application, as shown in Figure 1 FIG. 1 is a structural diagram of a chiller system provided by the embodiments of the present application.

[0048] Referring to Figure 1 The chiller system 11 includes a chiller 101, a water distributor 102, a water collector 103, a refrigeration water pump 104, a cooling water pump 105, and a cooling tower 106. The at least one chiller, the water distributor, the water collector, and the at least one refrigeration water pump connected in sequence form a refrigeration water circuit. The at least one chiller, the at least one cooling water pump, and the at least one cooling tower connected in sequence form a cooling water circuit.

[0049] In some embodiments, the chiller 101 is configured to cool the passing refrigeration water.

[0050] In some embodiments, as Figure 2As shown, the cold water main machine 101 includes a compressor 1011, a condenser 1012, an evaporator 1013, and a throttling device 1014. The compressor 1011, the condenser 1012, the evaporator 1013, and the throttling device 1014 are sequentially connected to form a refrigerant circulation loop. It should be noted that in the embodiments of the present application, the sequential connection only indicates the sequential relationship between the devices, and other devices can also be included between the devices. For example, a stop valve can be arranged on the pipeline between the compressor 1011 and the condenser 1012.

[0051] In refrigeration, as shown, Figure 3 The compressor 1011 compresses the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharges it to the condenser 1012. The high-temperature and high-pressure refrigerant gas exchanges heat with the outdoor air flow in the condenser 1012. The refrigerant releases heat, and the released heat is taken away by the air flow to the outdoor environment air. The refrigerant is phase changed and condensed into liquid or gas-liquid two-phase refrigerant. The refrigerant flows out of the condenser 1012, enters the throttling device 1014, and is cooled and decompressed into low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the evaporator 1013, absorbs the heat of the refrigerant in the evaporator 1013, and reduces the temperature of the refrigerant in the evaporator 1013, thereby achieving the refrigeration effect. The refrigerant is phase changed and evaporated into low-temperature and low-pressure refrigerant gas, which flows back into the compressor 1011, thereby realizing the circulation of the refrigerant.

[0052] In some embodiments, the inlet end of the water distributor 102 is connected to the outlet end of the cold water main machine 101, and the outlet end of the water distributor 102 is connected to the cold-using equipment, for distributing the chilled water flow to each branch to achieve pressure equalization.

[0053] In some embodiments, the inlet end of the water collector 103 is connected to the cold-using equipment, and the outlet end of the water collector 103 is connected to the chilled water pump through a chilled water pump valve, for collecting the chilled water of each branch.

[0054] In some embodiments, the water distributor 102 and the water collector 103 are connected to the cold-using equipment through a connecting pipeline. The chilled water flows through the cold-using equipment from the outlet end of the water distributor 102 through the connecting pipeline, and then enters the water collector 103 from the inlet end of the water collector 103 through the pipeline.

[0055] In some embodiments, at least one chilled water pump 104 is connected in parallel, the first end of the chilled water pump 104 is connected to the inlet end of the cold water main machine, and the second end of the chilled water pump 104 is connected to the outlet end of the water collector 103, for circulating the chilled water, so that the chilled water exchanges heat with the indoor air to reduce the temperature of the indoor air, thereby achieving the effect of cooling.

[0056] In some embodiments, the chilled water pump 104 further comprises a chilled water pump valve, and the flow rate of the chilled water in the pipeline is controlled by controlling the opening size of the chilled water pump valve.

[0057] In some embodiments, the at least one cooling water pump 105 is connected in parallel, and a first end of the cooling water pump 105 is connected to an outlet end of the water chiller 101, and a second end of the cooling water pump 105 is connected to a first end of the cooling tower 106. The cooling water pump 105 is used to circulate the cooling water. After the chilled water takes away the heat in the room, the heat is transferred to the cooling water through the chilled water in the water chiller 101. The cooling water pump pressurizes the heated cooling water into the cooling tower, so that the heated cooling water exchanges heat with the atmosphere, and further, the cooling water is sent back to the condenser 1012 in the water chiller 101 to continue heat exchange after being cooled.

[0058] In some embodiments, the cooling water pump 105 further comprises a cooling water pump valve, and the flow rate of the cooling water in the pipeline is controlled by controlling the opening size of the cooling water pump valve.

[0059] In some embodiments, a second end of the at least one cooling tower 106 is connected to an inlet end of the water chiller 101, for dispersing the heat in the water, and the heat is dissipated by air flow so that the water temperature is lowered, and then the cooling water is recycled.

[0060] As shown in FIG. 1, Figure 4 the water chiller system further comprises a first temperature sensor 1071, a second temperature sensor 1072, and at least one energy meter 108.

[0061] In some embodiments, the first temperature sensor 1071 is arranged at an outlet of the water distributor 102, for detecting the inlet water temperature of the chilled water pipeline.

[0062] In some embodiments, the second temperature sensor 1072 is arranged at an inlet of the water collector 103, for detecting the outlet water temperature of the chilled water pipeline.

[0063] In some embodiments, the at least one energy meter 108 is arranged on each chilled water pipeline, for detecting the flow rate of the water chiller 101.

[0064] As shown in FIG. 1, Figure 5 the water chiller system further comprises a controller 200, and the controller 200 is electrically connected to the water chiller 101, the water distributor 102, the water collector 103, the chilled water pump 104, the cooling water pump 105, and the cooling tower 106.

[0065] In some embodiments, the controller 200 refers to a device that can generate operation control signals according to instruction operation codes and timing signals, instructing the chiller system to execute control instructions. Exemplarily, the controller 200 can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 200 can also be other devices with processing functions, such as a circuit, a device, or a software module, and the embodiments of the present application do not make any limitation in this regard.

[0066] In some embodiments, the controller 200 can be a microcontroller unit (MCU). The MCU, also known as a single chip microcomputer or a single-chip microprocessor, is a chip-level computer that integrates a central processing unit, memory, timers, USB, A / D conversion, UART, PLC, DMA, and even LCD driving circuits on a single chip for different application scenarios.

[0067] In addition, the controller 200 can be used to control the operation of various components in the chiller system 11, so that the various components of the chiller system 11 operate to achieve the predetermined functions of the chiller system.

[0068] In some embodiments, the above-mentioned chiller system includes a chilled water circulation loop and a cooling water circulation loop. The chilled water is the refrigeration capacity of the air conditioner sent to the air-conditioned room through the pipeline and the chilled water pump, and the water temperature changes by 7-12°C. The cooling water, also known as coolant, is used to remove the heat generated by the operation of various components in the chiller system 11. If the heat is not removed in time, the temperature will be too high, which will cause damage to the high-temperature components. To this end, by using the heat conduction effect, when the cooling water flows through the high-temperature components, the heat is transferred from the high-temperature components to the cooling water, and the temperature of the cooling water rises. The cooling water in the cooling water circuit can continuously remove the heat, thereby completing the cooling of the high-temperature components.

[0069] In some embodiments, the heat exchange of the water chiller system has four processes: ① heat exchange between chilled water and air in the cooling field; ② heat exchange between chilled water and refrigerant in the evaporator; ③ heat exchange between cooling water and refrigerant in the condenser; and ④ heat exchange between cooling water and air in the cooling tower.

[0070] The chilled water circulation loop and the cooling water circulation loop are described below with reference to the accompanying drawings.

[0071] 1. Chilled water circulation loop

[0072] For example, the water chiller system shown in Figure 6 is taken as an example for illustration.

[0073] In the refrigeration mode, the chilled water in the water chiller main unit 101 exchanges heat with the refrigerant in the evaporator 1013, and the evaporation of the refrigerant absorbs heat to lower the temperature of the chilled water. The low-temperature chilled water flows out of the water chiller main unit 101 and flows into the water distributor 102, which then flows into each branch of the cooling equipment through the first connecting pipeline. The chilled water exchanges heat with the air in the cooling field, and the temperature of the chilled water rises. The chilled water then flows into the water collector 103 through the first connecting pipeline. The water collector 103 collects the chilled water from each branch, and the chilled water further returns to the water chiller main unit 101 through the chilled water pump 104, completing the circulation of the chilled water and the heat exchange between the chilled water and the indoor air to lower the temperature of the indoor air, thereby achieving the effect of cooling.

[0074] 2. Cooling water circulation loop

[0075] For example, the water chiller system shown in Figure 7 is taken as an example for illustration.

[0076] In the refrigeration mode, the chilled water in the water chiller main unit 101 transfers heat from the cooling field to the cooling water. The cooling water flows out of the water chiller main unit 101 and flows into the cooling water pump 105 through the second connecting pipeline. The cooling water pump 105 pressurizes the heated cooling water and sends it into the cooling tower 106, so that the heated cooling water exchanges heat with the atmosphere. Further, the cooling water is sent back to the condenser 1012 in the water chiller main unit 101 to continue heat exchange after being cooled in the cooling tower 106. In this process, the cooling water in the cooling water circulation loop can continuously take away heat, thereby achieving the effect of cooling the high-temperature components.

[0077] The embodiments of the present application are described below with reference to the accompanying drawings.

[0078] As shown in Figure 8 , the control method of the water chiller system provided by the embodiments of the present application is applied to a controller of the water chiller system, and the method comprises the following steps:

[0079] S101, acquire operation data of the water chiller system and user demand refrigerating capacity.

[0080] The operation data of the water chiller system includes: cold water main machine side refrigerating capacity, cold water machine room side refrigerating capacity, user side refrigerating capacity, outdoor temperature, outdoor humidity, average flow of personnel distribution in the area, building temperature preservation parameter, light intensity compensation value, indoor and outdoor air flow difference value, current time, first pipeline length, second pipeline length, refrigerated water pump valve opening number; the first pipeline length is the length of the connecting pipeline in the refrigerated water circulation loop in the cold water machine room; the second pipeline length is the length of the connecting pipeline in the refrigerated water circulation loop outside the cold water machine room.

[0081] For example, the cold water main machine side refrigerating capacity LQ1 satisfies the following relationship:

[0082] LQ1=Cp*q 冷水主机 *△T 冷水主机 *a

[0083] Wherein, q 冷水主机 is the refrigerated water flow; △T 冷水主机 is the difference between the inlet temperature and the outlet temperature of the cold water main machine.

[0084] For example, the cold water machine room side refrigerating capacity LQ2 satisfies the following relationship:

[0085] LQ2=∑(Cp*R*Vsi 机房出口 *ΔTi 机房出口 )

[0086] Wherein, i represents the number of pipeline of the i-th refrigerated water inlet section and outlet, i=1, 2, 3; ΔTi 机房出口 is the temperature difference of the energy meter at the outlet of the cold water machine room; Vsi 机房出口 is the flow value of the energy meter at the outlet of the cold water machine room; for example, ΔTi 机房出口 and Vsi 机房出口 can be collected through Modbus protocol.

[0087] For example, the i-th user side refrigerating capacity LQ3 satisfies the following relationship:

[0088] LQ3=∑(Cp*R*Vsi 用户 *ΔTi 用户 )

[0089] Wherein, i is a positive integer greater than 1.

[0090] For example, the multiple user side cumulative refrigerating capacity LQ3' satisfies the following relationship:

[0091] LQ3'=Cp*R*Vi 累积量 *ΔTi用户 *H

[0092] wherein, Vi 累积量 represents the cumulative amount of the ith cold-using device.

[0093] For example, the user demand refrigeration amount LQ4 satisfies the following relationship:

[0094] LQ4=Cp*R*Vsi*(T 设定值 -T 室内 )+V(T 室内 ,T 室外 ,S 室外 ,R 人数 ,a,b,c)

[0095] wherein, T 设定值 is the temperature set by the user; T 室内 is the indoor temperature; T 室外 is the outdoor temperature; S 室外 is the outdoor humidity; R 人数 is the average flow rate of the personnel distribution in the area; a is the building temperature maintenance parameter; b is the illumination intensity compensation value; and c is the indoor and outdoor air flow rate difference value.

[0096] S102, correcting the user demand refrigeration amount according to the operation data of the water chiller system to obtain a corrected user demand refrigeration amount.

[0097] For example, the corrected user demand refrigeration amount LQ4 xz satisfies the following relationship:

[0098] LQ4 xz =V(LQ4,T 室外 ,S 室外 ,R 人数 ,a,b,c)

[0099] wherein, LQ4 is the user demand refrigeration amount; T 室外 is the outdoor temperature; S 室外 is the outdoor humidity; R 人数 is the average flow rate of the personnel distribution in the area; a is the building temperature maintenance parameter; b is the illumination intensity compensation value; and c is the indoor and outdoor air flow rate difference value. V() represents a function for determining the corrected user demand refrigeration amount. It should be noted that the function can be obtained through simulation experiment simulation, or determined based on expert experience, or constructed based on deep learning, and the embodiments of the present application do not limit this.

[0100] S103, determining a first loss refrigeration amount and a second loss refrigeration amount according to the operation data of the water chiller system; wherein the first loss refrigeration amount is the refrigeration amount lost by the chilled water through the pipeline, and the second loss refrigeration amount is the refrigeration amount lost by the chilled water through each chilled water pump.

[0101] The first loss cooling capacity LQ ss1 satisfies the following relationship:

[0102] LQ ss1 = V1(LQ2, LQ3, T, L1, L2)

[0103] wherein LQ2 is the refrigerating capacity of the machine room side, LQ3 is the refrigerating capacity of the user side; T is the current time; L1 is the first pipe length; and L2 is the second pipe length. V1() represents a function for determining the first loss cooling capacity. It should be noted that the function can be obtained through simulation experiment simulation, or determined based on expert experience, or constructed based on deep learning, and the embodiments of the present application do not limit this.

[0104] The second loss cooling capacity LQ ss2 satisfies the following relationship:

[0105] LQ ss2 = V2(LQ1, LQ2, T, L1, I1)

[0106] wherein LQ2 is the refrigerating capacity of the machine room side; LQ3 is the refrigerating capacity of the user side; T is the current time; and I1 is the number of refrigerated water pump valves opened. V2() represents a function for determining the second loss cooling capacity. It should be noted that the function can be obtained through simulation experiment simulation, or determined based on expert experience, or constructed based on deep learning, and the embodiments of the present application do not limit this.

[0107] S104, determining the target refrigerating capacity according to the corrected user refrigerating capacity, the first loss cooling capacity and the second loss cooling capacity.

[0108] wherein the first loss cooling capacity is the cooling capacity lost by the chilled water through the pipe, and the second loss cooling capacity is the cooling capacity lost by the chilled water through each chilled water pump.

[0109] The target refrigerating capacity satisfies the following relationship:

[0110] V3(LQ4 xz ,LQ ss1 ,LQ ss2 ,T 室外 ,S 室外 ,t)

[0111] wherein V3() represents a function for determining the target refrigerating capacity. It should be noted that the function can be obtained through simulation experiment simulation, or determined based on expert experience, or constructed based on deep learning, and the embodiments of the present application do not limit this.

[0112] S105, controlling the water chiller system to work according to the target refrigerating capacity.

[0113] For example, the control of the operation of the chiller system by the controller satisfies the following relationship:

[0114] (Z, T zi , V i , VH i , Pd i , PH di , Pq i , PH qi , Ta i , TaH i ) = V3(LQ4 xz , LQ ss1 , LQ ss2 , T 室外 , S 室外 , t)

[0115] wherein Z is the number of chiller operation, T zi is the chilled water outlet temperature of the i-th chiller, V i is the number of chilled water pump valves, VH i is the opening of the i-th chilled water pump valve, Pd i is the number of chilled water pump operation, PH di is the frequency of the i-th chilled water pump operation, Pq i is the number of cooling water pump operation, PH qi is the frequency of the i-th cooling water pump operation, Ta i is the number of cooling tower operation, and TaH i is the frequency of the i-th cooling tower fan operation.

[0116] Figure 8The embodiment shown at least brings the following beneficial effects: during the operation of the water chiller air conditioning system, the chilled water main machine generates refrigerating capacity, and then the chilled water in the chilled water circulation loop exchanges heat with the space where the cold equipment is located to achieve the effect of cooling the space where the cold equipment is located. In this process, due to the loss of the chilled water during the process of passing through the connecting pipeline and the chilled water pump and other equipment, the refrigerating capacity of the user side is different from the refrigerating capacity of the chilled water main machine side, so that the user demand refrigerating capacity is corrected according to the operation data of the water chiller to obtain a more accurate user side refrigerating capacity. Further, the more accurate user side refrigerating capacity is taken as the target refrigerating capacity to control the operation of the air conditioning system to meet the refrigerating capacity demand of the user. At the same time, on the basis of the corrected user demand refrigerating capacity, the first loss refrigerating capacity and the second loss refrigerating capacity, the outdoor temperature and the outdoor temperature can be obtained. More accurate target refrigerating capacity. On the one hand, the target refrigerating capacity can dynamically adjust the number of water chiller main machines and add or subtract, so that the water chiller system continuously operates in the high efficiency interval to ensure the continuous high efficiency operation of the water chiller system. On the other hand, the target refrigerating capacity can dynamically adjust the opening, the number of operation and the operation frequency of the chilled water pump and the cooling water pump, so as to reduce the power consumption of the auxiliary equipment, thereby making the water chiller system high efficiency and environmental protection.

[0117] In some embodiments, Figure 9 A cold equipment communication topology is provided for the embodiments of the present application. As Figure 9 shown, the cold equipment can be a water machine air disc, a fresh air machine, etc., which is not limited. Among them, the connection between each cold equipment and the water chiller system is a dual connection mode of wired connection and wireless connection. When the data monitoring module detects that the wireless signal is blocked or the signal strength is weak, it can be seamlessly switched to wired mode. In this way, the stability of the cold equipment data acquisition can be increased to more accurately control the user load.

[0118] As a possible implementation, the field controller transmits the running state and parameters of the cold equipment to the regional wireless gateway through the wireless module, the regional wireless gateway uploads the data to the load monitoring module through the router, and the load monitoring module obtains the real-time cold load and the cumulative load of the user by using the received inlet and outlet temperature difference and flow of the user cold equipment.

[0119] It can be seen that the above mainly introduces the scheme provided by the embodiments of the present application from the method aspect. To implement the above functions, the embodiments of the present application provide corresponding hardware structures and / or software modules for executing various functions. Those skilled in the art should easily realize that, in combination with the modules and algorithm steps of the examples described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0120] The embodiments of the present application can divide the functions of the controller according to the above method examples, for example, each function module can be divided according to each function, or two or more functions can be integrated in one processing module. The above integrated module can be implemented in the form of hardware or software function module. Optionally, the division of the module in the embodiments of the present application is illustrative, and is only a logical function division. When actually implemented, there can be another division manner.

[0121] The embodiments of the present application also provide a hardware structure schematic diagram of a controller, as shown in Figure 10 The controller 200 further includes a processor 201, and optionally further includes a memory 202 and a communication interface 203 connected with the processor 201. The processor 201, the memory 202 and the communication interface 203 are connected through a bus 204.

[0122] The processor 201 can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD) or any combination thereof. The processor 201 can also be other any device with processing function, such as a circuit, a device or a software module. The processor 201 can also include multiple CPUs, and the processor 201 can be a single-CPU processor or a multi-CPU processor. The processor herein can refer to one or more devices, circuits or processing cores for processing data (for example, computer program instructions).

[0123] The memory 202 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magneto-optical disk storage, a magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, and the embodiments of the present application do not make any limitation on this. The memory 202 can exist independently or be integrated with the processor 201. The memory 202 can contain computer program code. The processor 201 is configured to execute the computer program code stored in the memory 202, so as to implement the control method provided by the embodiments of the present application.

[0124] The communication interface 203 can be configured to communicate with other devices or communication networks (such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.). The communication interface 203 can be a module, a circuit, a transceiver or any device capable of realizing communication.

[0125] The bus 204 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 204 can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 10 Only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0126] The embodiments of the present application also provide a computer readable storage medium, including computer execution instructions, when running on a computer, causing the computer to execute any one of the control methods of the cold water machine system provided by the above embodiments.

[0127] The embodiment of the present application further provides a computer program product comprising computer-executable instructions which, when executed on a computer, cause the computer to perform the control method of the chiller system provided by any of the above embodiments.

[0128] In the above embodiments, the implementation can be achieved by software, hardware, firmware or any combination thereof, entirely or partially. When implemented by using software, the implementation can be achieved by a computer program product, entirely or partially. The computer program product includes one or more computer-executable instructions. When the computer-executable instructions are loaded and executed on a computer, the entire or partial processes or functions according to the embodiments of the present application are produced. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer-executable instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer-executable instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or data storage device including one or more servers, data centers, etc. integrated with the medium. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state disk (SSD)), etc.

[0129] Although the present application is described herein in conjunction with various embodiments, other variations of the disclosed embodiments can be understood and implemented by those skilled in the art upon inspection of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. Measures recited in mutually different dependent claims can be combined, and the resulting combination can also be claimed.

[0130] Although the present application has been described in connection with certain specific features and embodiments thereof, it is to be understood that it is intended to cover all modifications and variations of this application which are within the scope of the appended claims and their equivalents. Accordingly, the description and drawings are to be regarded as illustrative in nature and not as restrictive.

[0131] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A water chiller system, characterized by, The system comprises: a chilled water circulation loop comprising at least one chilled water main unit, a water distributor, a water collector, and at least one chilled water pump connected in sequence; a cooling water circulation loop comprising at least one chilled water main unit, at least one cooling water pump, and at least one cooling tower connected in sequence; a controller configured to: obtain operation data of the chilled water unit system and user demand refrigerating capacity; wherein the operation data of the chilled water unit system comprises chilled water main unit side refrigerating capacity, user side refrigerating capacity, current time, first pipe length, and second pipe length; correct the user demand refrigerating capacity according to the operation data of the chilled water unit system to obtain corrected user demand refrigerating capacity; determine first loss refrigerating capacity and second loss refrigerating capacity according to the operation data of the chilled water unit system; wherein the first loss refrigerating capacity is the refrigerating capacity lost by the chilled water through the pipe, and the second loss refrigerating capacity is the refrigerating capacity lost by the chilled water through each chilled water pump; determine target refrigerating capacity according to the corrected user demand refrigerating capacity, the first loss refrigerating capacity, and the second loss refrigerating capacity; control the chilled water unit system to work according to the target refrigerating capacity; wherein the controller is configured to determine the first loss refrigerating capacity and the second loss refrigerating capacity according to the operation data of the chilled water unit system, and specifically perform the following steps: determine the first loss refrigerating capacity according to the chilled water main unit side refrigerating capacity, the user side refrigerating capacity, the current time, and the first pipe length; determine the second loss refrigerating capacity according to the chilled water main unit side refrigerating capacity, the user side refrigerating capacity, the current time, and the second pipe length.

2. The water chiller system according to claim 1, wherein The operation data of the chilled water unit system further comprises chilled water main unit side refrigerating capacity, outdoor temperature, outdoor humidity, average flow of personnel distribution in the area, building temperature maintenance parameter, light intensity compensation value, indoor and outdoor air flow rate difference value, and number of chilled water pump valves opened; wherein the first pipe length is the length of the pipe in the chilled water circulation loop belonging to the chilled water unit room, and the second pipe length is the length of the pipe in the chilled water circulation loop belonging to outside the chilled water unit room.

3. The chilled water unit system according to claim 2, wherein the controller is configured to correct the user demand refrigerating capacity according to the operation data of the chilled water unit system to obtain corrected user demand refrigerating capacity, and specifically perform the following steps: correct the user demand refrigerating capacity according to the outdoor temperature, the outdoor humidity, the average flow of personnel distribution in the area, the light intensity compensation value, and the indoor and outdoor air flow rate difference value to obtain the corrected user demand refrigerating capacity.

4. A control method of a water chiller system, characterized by, The method comprises: obtaining operation data of the chilled water unit system and user demand refrigerating capacity; wherein the operation data of the chilled water unit system comprises chilled water main unit side refrigerating capacity and user side refrigerating capacity; correcting the user demand refrigerating capacity according to the operation data of the chilled water unit system to obtain corrected user demand refrigerating capacity; and controlling the chilled water unit system to work according to the target refrigerating capacity. Determine a first loss cold quantity and a second loss cold quantity according to operation data of the chiller system; wherein the first loss cold quantity is a cold quantity lost by chilled water through a pipeline, and the second loss cold quantity is a cold quantity lost by chilled water through each chilled water pump; Determine a target refrigeration quantity according to the corrected user demand refrigeration quantity, the first loss cold quantity and the second loss cold quantity; Control the chiller system to work according to the target refrigeration quantity; Wherein, the determining the first loss cold quantity and the second loss cold quantity according to the operation data of the chiller system comprises: Determine the first loss cold quantity according to the machine room side refrigeration quantity, the user side refrigeration quantity, the current time and the first pipeline length; Determine the second loss cold quantity according to the machine room side refrigeration quantity, the user side refrigeration quantity, the current time and the second pipeline length.

5. The method of claim 4, wherein, The operation data of the chiller system comprises: a chilled water main machine side refrigeration quantity, an outdoor temperature, an outdoor humidity, an average flow of personnel distribution in a region, a building temperature maintenance parameter, an illumination intensity compensation value, an indoor and outdoor air flow rate difference value, a current time, a first pipeline length, a second pipeline length, and a chilled water pump valve opening number; wherein, The first pipeline length is a length of a pipeline in the chilled water circulation loop that belongs to a chilled water machine room, and the second pipeline length is a length of a pipeline in the chilled water circulation loop that belongs to outside of the chilled water machine room.

6. The method of claim 5, wherein, The correcting the user demand refrigeration quantity according to the operation data of the chiller system to obtain a corrected user demand refrigeration quantity specifically comprises: Correct the user demand refrigeration quantity according to the outdoor temperature, the outdoor humidity, the average flow of personnel distribution in the region, the illumination intensity compensation value and the indoor and outdoor air flow rate difference value to obtain the corrected user demand refrigeration quantity.

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